How do I change my Facebook username again?

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TO CHANGE YOUR USER NAME ON FACEBOOK,
if you're using a smart phone,
1. Tap photo at the top left of any page
2. Scroll to the bottom of the menu
3. Tap account> account settings
4. Tap general
5. In the name section'tap edit.
If you're using other phone,
1. Click settings at the bottom of every page
2. Find the name section
3. Click edit
for the changes to be confirmed, wait a period of 24 hours.